检索结果-南通市图书馆

Mesomorphic Studies on a Series of Nickel (II) Centered Aromatic Complexes Displaying Liquid Crystalline Phases

World Journal of Condensed Matter Physics 2022年第3期12卷 27-37页

作者： wajdi michael zoghaib Carlo Carboni Mohammed Elias Molla Turkiya Al-Shahumi Raya Al-Yazeedi Department of Chemistry Sultan Qaboos University Al-Khod Sultanate of Oman Department of Physics Sultan Qaboos University Al-Khod Sultanate of Oman Department of Chemistry Jahangirnagar University Dhaka Bangladesh

Two new series (A & B) of three materials each based on the aroyl hydrazinato-nickel (II) complex were synthesized and characterized. The core molecule in these series consists of two 4-benzoyloxy benzylidene moieties and two benzene rings attached at the azomethine moiety. These latter benzene rings have one or two alkoxy chains comprised of either 10, 12, 16 or 18 carbon atoms. The characterization of these two series by polarized optical microscopy and differential scanning calorimetry is described herein. Upon cooling from the Isotropic phase, three of the six materials display a monophasic columnar phase and the other three possess a biphasic nematic and columnar phases. Upon heating, all six materials have a clearance point at high temperatures without displaying mesomorphic behavior. In series B mesogens, it was observed that the longer the hydrocarbon tail length, the lower the clearance point.

关键词： Columnar Mesomorphic Nematic Discotic Metallomesogens Polarized Optical Microscopy Differential Scanning Calorimetry

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phase Transition Investigations of a Series of Aromatic Naphthalene-2-yl-4-(Alkoxy) Benzoate and Naphthalene-1-yl-4-(Alkoxy) Benzoate Materials

引用

World Journal of Condensed Matter Physics 2022年第1期12卷 1-7页

作者： wajdi michael zoghaib Carlo Carboni Mohammed Elias Molla Samiya Al-Mahrezi Turkiya Al-Shahumi Sanaa Al-Badi Muna Al-Farsi Department of Chemistry Sultan Qaboos University Al-Khod Sultanate of Oman Department of Physics Sultan Qaboos University Al-Khod Sultanate of Oman Department of Chemistry Jahangirnagar University Dhaka Bangladesh

The mesogenic properties of a homologous series of aromatic ester materials are investigated. Single tail and double tail materials were synthesized to compare with other series we prepared and published earlier. The phase sequences and transition temperatures were obtained by polarized light microscopy and differential scanning calorimetry. Only the single tail materials with the ester attached to naphthalene at position 2 display mesogenicbehavior. Two materials (ZH 29 & ZH 32) possess a monophasic nematic phase and another two materials (ZH 14 & ZH 35) display biphasic nematic and smectic (A) phases.

关键词： Liquid Crystals Mesomorphism Calamitic Nematic Smectic A Polarized Optical Microscopy Differential Scanning Calorimetry

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Dielectric and Spontaneous Polarization Studies of a Ferroelectric Chiral Smectic Liquid Crystal

引用

World Journal of Condensed Matter Physics 2012年第2期2卷 75-79页

作者： Abraham K. George C. Carboni S. H. Al-Harthi W. M. zoghaib D. M. Potukuchi Department of Chemistry Sultan Qaboos University Muscat Oman Department of Physics Sultan Qaboos University Muscat Oman Department of Physics University College of Engineering Jawaharlal Nehru Technological University Kakinada India

Dielectric relaxation and spontaneous polarization studies have been carried out in a low molar mass organosiloxane liquid crystal, TSi10PPBN4 which displays a wide temperature range of de Vries Smectic A* and chiral Smectic C* phases. The temperature variation of the permittivity and dielectric loss studied are found to have anomalous variations in the vicinity of the phase transitions. The frequency variation of permittivity and dielectric loss are also studied in the de Vries Smectic A* and Smectic C* phases. The relaxation frequency, fR is found to decrease with decreasing temperature. Temperature variation of fR is found to follow an Arrhenius shift from which the activation energy is estimated. The thermal variation of the spontaneous polarization, Ps is measured using the polarization reversal technique in the Smectic C* phase. Ps increases initially, reaches a peak value and then drops drastically in the vicinity of the SmC*-SmA*de Vries phase transition.

关键词： Smectic C* and Smectic A*de Vries Phases Dielectric Permittivity Dielectric Relaxation Activation Energy Spontaneous Polarization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：